How to choose the rolling temperature of titanium plate?

As titanium plate titanium alloy material hot rolling should be generally in B or a+P phase zone. Hot rolling temperature than forging temperature line 50~100℃, thickness of 2~5mm plate can adopt warm rolling process, thinner size plate can be cold rolling. The deformation of cold rolling between two annealing is 15%~60%. Titanium and titanium alloy are metal with phase change, the selection of slab heating temperature must consider the process plasticity of a+ beta phase region, deformation resistance and the influence of the suction layer on the surface plasticity of rolled piece at high temperature. The process plasticity of B phase zone is better than that of a phase zone, and the deformation resistance is lower, but the heating temperature is high, which increases the depth of the suction layer, and serious cracks will occur on the surface when the uneven deformation.

titanium alloy plate

Titanium plate hot rolling in the phase zone, can ensure a good process plasticity, the total processing rate can reach 90%. Pure titanium TA1, TA2 and TA3 are usually heated at 850~870℃ below the phase transition point, while TC4 should be heated at the upper limit of phase transition point a+B or superplastic forming process (heating at 1000~950℃). For TC1, TC2, TC3, etc., the plasticity of hot rolling is poor. The thicker the slab is, the more serious the edge crack and surface crack are caused by the uneven deformation in rolling. Although TA7 has good oxidation resistance, it has high alloying degree and high deformation resistance. Therefore, the heating temperature of TA7 slab in the B phase zone is more conducive to deformation and can make full use of the plasticity of the alloy and reduce the tempering times.